Citizens in an urban area where asked whether or not they favored a particular bond issue.  The following contigency table was obtained.     Approve Disapprove Neither Aprove nor Disapprove Live in the city 70 100 20 Live in the suburbs 80 90 30   What test is appropriate?  (Choose 1, 2, or 3)  1) t-test   2) chi-square test of independence  3)  chi-square test of goodness of fit  4) z-test of proportion   How many degrees of freedom are there?   What is the expected value, , to two decimal places?   If we are performing a classical test of hypothesis with  what ist the critical value (from the appropriate table in the table folder within content)?   Still performing a classical test of hypothesis, if the test statistic is 2.94 do we 1) reject the null hypothesis  2) fail to reject the null hypothesis

You want to obtain a sample to estimate a percentage of Statistics students at ACM that get a grade of at least a C. You would like to be 90% confident that your estimate is within 1.5% of the true population proportion. a) You have no reasonable estimate for the population proportion. You do not know the number Statistics students at ACM. How large of a sample size is required?  b) You estimate the population proportion to be 90 percent. You do not know the number Statistics students at ACM. How large of a sample size is required?  c) You have no reasonable estimate for the population proportion. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required? d) You estimate the population proportion to be 90 percent. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required?

You want to obtain a sample to estimate a percentage of Statistics students at ACM that get a grade of at least a C. You would like to be 99.9% confident that your estimate is within 1% of the true population proportion. a) You have no reasonable estimate for the population proportion. You do not know the number Statistics students at ACM. How large of a sample size is required?  b) You estimate the population proportion to be 77 percent. You do not know the number Statistics students at ACM. How large of a sample size is required?  c) You have no reasonable estimate for the population proportion. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required? d) You estimate the population proportion to be 77 percent. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required?

Statistics Question

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It is believed that large doses of acetaminophen (the active ingredient in over the counter pain relievers like Tylenol) may cause damage to the liver. A researcher wants to conduct a study to estimate the proportion of acetaminophen users who have liver damage. For participating in this study, he will pay each subject $20 and provide a free medical consultation if the patient has liver damage.   a) If he wants to limit the margin of error of his 95% confidence interval to 1%, what is the minimum amount of money he needs to set aside to pay his subjects?

a programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99​% confident that his estimate is in error by no more than three percentage points? Complete parts​ (a) through​ (c) below.   ​a) Assume that nothing is known about the percentage of computers with new operating systems. n = b) Assume that a recent survey suggests that about 98​% of computers use a new operating system.n = c) Does the additional survey information from part​ (b) have much of an effect on the sample size that is​ required?

A programmer is planning to develop a new sohasem system in planning the operating system he will use to estimate the percentage of computers using the new operating system. How many computers need to be scanned in order to be 99% confident that his fate in Turbie is no more than three percentage points?   b. Assume a recent survey indicates that about 87% of computers are in operating systems n. Rounding to the nearest whole number)

When an airline sells tickets for a flight, only about 90% of people who buy a ticket actually show up.a) For a flight with 400 seats, the airline can be 95% confident that between ____ and _____ percent of people will actually show up. Fill in the blanks with a percentage.b) Approximately how many tickets should they sell so that there is less than a 10% chance they run out of seats?

0.05 level to determine if pizza preference is dependent on grade leven ETTE Cheese Pepperoni Everything 6th Grade 8. 11 11 7th Grade 17 8. 8th Grade 12 12 6.